Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dao truc » dao tuc, dai truc, vao truc
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty xang xa hoi. hieu va ((dao truc) OR (dao tru)) van ((anh va) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty xang xa hoi. hieu va ((dao truc) OR (dao tru)) van ((anh va) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty xang xa hoi. hieu va ((dao truc) OR (dao tru)) van ((anh va) or (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty xang xa hoi. hieu va ((dao truc) OR (dao tru)) van ((anh va) or (hanh va)) cua tre*.